Smith-Magenis syndrome (SMS) is a rare syndrome with multiple congenital malformations, including development and mental retardation, behavioral problems and a distinct facial
[ncbi.nlm.nih.gov]
These behavioral problems include frequent temper tantrums, meltdowns and outbursts, aggression, anger, fidgeting, compulsive behavior, anxiety, impulsiveness, and difficulty
[en.wikipedia.org]
A 3-year-old girl was referred for evaluation of moderate psychomotor retardation and several behavioral problems including self-injuring behavior, hyperactivity, and sleep
[ncbi.nlm.nih.gov]